JPH07128707A - Finder optical system using low moisture absorption organic material - Google Patents
Finder optical system using low moisture absorption organic materialInfo
- Publication number
- JPH07128707A JPH07128707A JP5277032A JP27703293A JPH07128707A JP H07128707 A JPH07128707 A JP H07128707A JP 5277032 A JP5277032 A JP 5277032A JP 27703293 A JP27703293 A JP 27703293A JP H07128707 A JPH07128707 A JP H07128707A
- Authority
- JP
- Japan
- Prior art keywords
- optical system
- organic material
- optical
- low hygroscopic
- hygroscopic organic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 133
- 239000011368 organic material Substances 0.000 title claims abstract description 25
- 238000010521 absorption reaction Methods 0.000 title abstract description 15
- 239000003973 paint Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 30
- 238000000034 method Methods 0.000 description 20
- 230000004075 alteration Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 125000003518 norbornenyl group Chemical group C12(C=CC(CC1)C2)* 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/14—Viewfinders
Landscapes
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
- Viewfinders (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、銀塩カメラ，電子撮像
機器のファインダー系並びに双眼鏡等に用いられる眼に
よって被写体像を観察する光学系に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silver salt camera, a viewfinder system of electronic image pickup equipment, and an optical system for observing a subject image with eyes used for binoculars and the like.
【０００２】[0002]
【従来の技術】有機材料を光学系に用いる場合、一般
に、大気中の水蒸気を吸収或いは光学系中の水分を排出
することにより、レンズの屈折率や寸法に変化が生じて
光学特性の変動をもたらすことが知られている。この対
策として、特開平３−１８１９０８号公報に開示されて
いるように、有機材料を用いた素子を各鏡枠の内部に配
置し、大気と接する最外側を無機材料（吸湿のない材料
としか記載されていないが、実施例の光学特性から判断
して光学ガラスしか該当しない）で形成して、蓋をして
内部の湿度が組立時の状態に保持される構造とし、これ
により大気中の湿度の変化に作用されず一定の光学特性
が維持できる方法が知られている。又、特開平４−３４
９４１８号公報に開示されているように、ノルボルネン
骨格を有する熱可塑性樹脂を対物レンズの一つに用いて
吸湿によるレンズ変形に基づく光学特性の劣化を防止す
る方法が知られている。更に、本願と同一出願人によっ
て出願中の特願平５−１１３１９７号明細書に記載され
ているように、焦点検出装置のレンズに吸水線膨張率の
小さい材質（例えばポリオレフィン樹脂）で形成し、湿
度変化に伴う屈折率や形状変化による焦点検出性能の低
下を防止する方法も知られている。2. Description of the Related Art In general, when an organic material is used in an optical system, absorption of water vapor in the atmosphere or discharge of water in the optical system causes a change in the refractive index and size of the lens to cause fluctuations in optical characteristics. Known to bring. As a countermeasure against this, as disclosed in Japanese Patent Application Laid-Open No. 3-181908, an element using an organic material is arranged inside each lens frame, and the outermost portion in contact with the atmosphere is made of an inorganic material (only a material that does not absorb moisture). Although it is not described, only optical glass is applicable, judging from the optical characteristics of the example), and the structure is such that the internal humidity is maintained at the time of assembly by covering with a lid. A method is known in which constant optical characteristics can be maintained without being affected by changes in humidity. In addition, JP-A-4-34
As disclosed in Japanese Patent No. 9418, a method is known in which a thermoplastic resin having a norbornene skeleton is used as one of the objective lenses to prevent deterioration of optical characteristics due to lens deformation due to moisture absorption. Further, as described in Japanese Patent Application No. 5-113197 filed by the same applicant as the present application, the lens of the focus detection device is formed of a material having a small coefficient of linear expansion of water absorption (for example, a polyolefin resin), There is also known a method of preventing a decrease in focus detection performance due to a change in refractive index or a shape due to a change in humidity.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、特開平
３−１８１９０８号公報に記載された方法では、蓋とし
て使用する光学部品が必要とされるため、確実に部品点
数の増加を招く。而も、可動群を装置内部に封じ込める
ことは、空気ポンプの効果により前記可動群の作動が円
滑に行われなくなるので、可動群毎に必ず蓋の役割をす
る光学部品を二点ずつ配置しなくてはならない。よっ
て、益々装置の構成部品点数の増加を招き、変倍部を含
む光学系への適用は実質上不可能になる。However, in the method disclosed in Japanese Patent Laid-Open No. 3-181908, an optical component used as a lid is required, so that the number of components is surely increased. In addition, if the movable group is enclosed inside the device, the operation of the movable group will not be performed smoothly due to the effect of the air pump. Therefore, it is not necessary to arrange two optical parts that function as a lid for each movable group. must not. Therefore, the number of component parts of the apparatus is further increased, and application to an optical system including a variable power portion becomes substantially impossible.
【０００４】又、特開平４−３４９４１８号公報及び本
願と同一出願人が出願中の特願平５−１１３１９７号明
細書では、吸湿による屈折率変化や形状変化が均質に発
生することを想定し、それによって影響を受けやすく元
来パワーを有するレンズ部品に低吸湿材料を用いる方法
が記載されているが、均質に変化が起こるのは吸湿が飽
和した状態であり、実使用される状況下においては、屈
折率はレンズの表面近傍と中心部とでは異なり、いわゆ
る不均質な分布が生じているはずである。この場合、元
来パワーを有しない光学部品にも屈折率の分布によるパ
ワーが発生することになる。そして、飽和して均質化し
てしまうと、ノンパワーに近づくことになる。しかしな
がら、このような過渡的な特性の変動を減らす方法は云
うに及ばず、こうした問題の所在についてさえ、上記何
れの先行例においても認識されていない。Further, in Japanese Patent Application Laid-Open No. 4-349418 and Japanese Patent Application No. 5-113197 filed by the same applicant as the present application, it is assumed that a change in refractive index and a change in shape due to moisture absorption occur uniformly. , A method of using a low hygroscopic material for a lens component which is easily affected by it and originally has power is described, but it is in a saturated state of hygroscopicity that a uniform change occurs in a situation where it is actually used. The refractive index is different between the vicinity of the surface of the lens and the central part, and so-called inhomogeneous distribution should occur. In this case, power is generated due to the distribution of the refractive index even in an optical component that originally has no power. Then, when it is saturated and homogenized, it approaches non-power. However, not to mention a method for reducing such transient characteristic variation, even the location of such a problem is not recognized in any of the above-mentioned prior art examples.
【０００５】そこで、上記のような従来技術の有する問
題点に鑑み、本発明は、光学系の構成部材の吸湿に伴う
過渡的な特性変動を軽減するために、前記部材を適切な
低吸湿有機材料で形成した低吸湿有機材料を用いたファ
インダー光学系を提供することを目的としている。In view of the problems of the prior art as described above, the present invention provides an appropriate low hygroscopic organic material in order to reduce transient characteristic fluctuations due to moisture absorption of the constituent members of the optical system. An object is to provide a finder optical system using a low hygroscopic organic material formed of a material.
【０００６】[0006]
【課題を解決するための手段及び作用】上記目的を達成
するため、本発明による低吸湿有機材料を用いたファイ
ンダー光学系は、被写体側より、対物レンズ系と、前記
対物レンズ系によって形成された被写体像を正立させる
像正立系と、前記像を観察者の眼球により観察できるよ
うにアイポイントへ導く接眼レンズから成る光学系にお
いて、前記光学系を低吸湿有機材料を用いた部材により
構成したことを特徴としている。更に、本発明の光学系
は、比較的中肉が厚く光軸に垂直な断面形状の縦横の長
さの比が相違するレンズ，比較的光路長が長く光軸に垂
直な断面形状の縦横の長さの比が異なるプリズム及び境
界面の一部がコーティング若しくは塗料等により被膜さ
れている光学部品が夫々低吸湿有機材料により形成され
ていることを特徴としている。In order to achieve the above object, a finder optical system using a low hygroscopic organic material according to the present invention is formed by an objective lens system and the objective lens system from the object side. In an optical system including an image erecting system for erecting a subject image and an eyepiece for guiding the image to an eye point so that the image can be observed by an observer's eye, the optical system is composed of a member using a low hygroscopic organic material. It is characterized by having done. Further, the optical system of the present invention includes a lens having a relatively thick thickness and a sectional shape perpendicular to the optical axis having a different vertical / horizontal length ratio, and an optical system having a comparatively long optical path length and a sectional shape perpendicular to the optical axis. It is characterized in that prisms having different length ratios and optical parts in which a part of the boundary surface is coated or coated with paint or the like are made of a low hygroscopic organic material.
【０００７】ところで、屈折率分布が光学部品のパワー
に与える影響は以下の通りである。 （１） 光軸方向の屈折率勾配は殆どパワーに影響を与
えない。 （２） 光軸と垂直方向との屈折率の勾配が大きい程、
パワーも大きくなる。 （３） 光軸と傾いた方向との屈折率勾配は、上記
（１）と（２）との間の状態の下でパワーへの影響度が
変化する。 （４） 光線の通過する媒質の厚みが大きい程、パワー
も大きくなる。 （５） 光軸に垂直で互いに直交する方向の屈折率勾配
が異なると、アジマスによりパワーが異なり、光軸上に
非点隔差が発生する。 更に、屈折率勾配が形成される状態においては、 （６） 光軸から外気と接する面までの距離が異なると
屈折率勾配が異なるということが云える。The influence of the refractive index distribution on the power of optical components is as follows. (1) The refractive index gradient in the optical axis direction hardly affects the power. (2) The larger the gradient of the refractive index between the optical axis and the vertical direction,
The power also increases. (3) The degree of influence on the power of the refractive index gradient between the optical axis and the inclined direction changes under the condition between the above (1) and (2). (4) The power increases as the thickness of the medium through which the light ray passes increases. (5) If the refractive index gradients in the directions perpendicular to the optical axis and orthogonal to each other are different, the power is different due to azimuth, and astigmatic difference occurs on the optical axis. Further, in the state where the refractive index gradient is formed, (6) It can be said that the refractive index gradient is different if the distance from the optical axis to the surface in contact with the outside air is different.
【０００８】従って、上記性質から推定して以下の形態
を有する光学部品について、屈折率分布に基づくパワー
の発生や中心でのアスの発生が顕著になると考えられ
る。 （イ） 上記（４）を根拠として、光軸に沿った距離の
長い光学部品。 （ロ） 上記（１）に従う入射面や（３）に従う反射面
といった光学面に対し、（２）に従う外側面の面積が無
視できない光学系。 （ハ） 上記（６）に従う光軸に垂直な断面の形状が等
方的なものから著しく外れる、例えば縦横の長さの比が
大きく異なる光学部品。 （ニ） 境界面の一部がコーティングや塗装で覆われて
いて吸湿に関与できる面積や方向に偏りが生じる部品。Therefore, it is considered that the generation of power based on the refractive index distribution and the generation of astigmatism at the center become conspicuous in the optical component having the following form estimated from the above properties. (A) An optical component having a long distance along the optical axis based on the above (4). (B) An optical system in which the area of the outer surface according to (2) is not negligible with respect to the optical surface such as the incident surface according to (1) or the reflecting surface according to (3). (C) An optical component in which the shape of the cross section perpendicular to the optical axis according to (6) above is significantly deviated from isotropic, for example, the ratio of the length to the length is greatly different. (D) A part of the boundary surface is covered with coating or paint, and there is a deviation in the area or direction in which it can participate in moisture absorption.
【０００９】従って、上記形態を有する光学部品に低吸
湿材料を用いることによって、吸湿により発生する過渡
的な光学特性の変化を軽減することができる。特に、前
記材料に有機材料を用いれば、光学系の成形が容易にな
り、又、光学系の製造工程における低コスト化及び光学
系の軽量化を同時に達成でき、高品質で使い易い光学系
を提供できる。Therefore, by using a low hygroscopic material for the optical component having the above-described configuration, it is possible to reduce a transient change in optical characteristics caused by moisture absorption. In particular, if an organic material is used as the material, molding of the optical system can be facilitated, and cost reduction and weight reduction of the optical system can be achieved at the same time, and an optical system of high quality and easy to use can be obtained. Can be provided.
【００１０】[0010]
【実施例】以下、図示した実施例に基づき本発明を詳細
に説明する。図１乃至３は、本発明の第一実施例を示し
ている。図１は、本実施例における光学系のレンズ構成
図である。図２は、図１に示した光学系の光軸に沿った
断面図であり、（ａ）は低倍率端，（ｂ）は中間倍率，
（ｃ）は高倍率端での状態を夫々示した図である。又、
図３は、本実施例の光学系の収差曲線図であり、（ａ）
は低倍率端，（ｂ）は中間倍率，（ｃ）は高倍率端での
状態を夫々示した図である。本実施例の光学系は、図１
に示したように、全体として正の屈折力を有する対物レ
ンズ系１と、像正立系として設けられた第一プリズム２
及び第二プリズム３と、接眼レンズ系４とから構成され
ている。又、第一プリズム２及び第二プリズム３は、光
路長が非常に長く縦横の長さの比が大きく異なってお
り、更に、低吸湿有機材料を用いて形成することによ
り、発生する過渡的な光学特性の変化を軽減することが
できる。更に、上記第一及び第二プリズム以外のレンズ
を比較的中肉が厚く縦横の長さの比が異なるように構成
し、且つ、低吸湿有機材料を用いて形成することで、吸
湿により発生する過渡的な光学特性の変化をより一層軽
減できる。The present invention will be described in detail below with reference to the illustrated embodiments. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a lens configuration diagram of an optical system in the present embodiment. 2 is a sectional view taken along the optical axis of the optical system shown in FIG. 1, where (a) is a low magnification end, (b) is an intermediate magnification,
(C) is a figure showing the state at the high magnification end, respectively. or,
FIG. 3 is an aberration curve diagram of the optical system of the present embodiment, (a)
FIG. 4A is a diagram showing a state at a low magnification end, FIG. 7B is a state at an intermediate magnification, and FIG. The optical system of this embodiment is shown in FIG.
, The objective lens system 1 having a positive refracting power as a whole and the first prism 2 provided as an image erecting system
And the second prism 3 and the eyepiece system 4. Further, the first prism 2 and the second prism 3 have very long optical path lengths and greatly differ in the ratio of the length and width, and further, when they are formed by using a low hygroscopic organic material, they are transiently generated. It is possible to reduce changes in optical characteristics. Further, the lenses other than the first and second prisms are configured to have a relatively medium thickness and different length / width ratios, and are formed by using a low hygroscopic organic material. It is possible to further reduce transient changes in optical characteristics.
【００１１】以下、本実施例のデータを示す。 ファインダー倍率 ０．４０〜０．７５〜１．４３倍 視度（ディオプトリー） −０．５(diop) 視野角（２ω） ５５．８〜２９．６〜１５．２° ｒ1 ＝8.5460 ｄ1 ＝1.200 ｎ1 ＝1.58423 ν1 ＝30.49 ｒ2 ＝5.3511 (非球面) ｄ2 ＝2.623 ｒ3 ＝-15.9103 ｄ3 ＝1.200 ｎ3 ＝1.58423 ν3 ＝30.49 ｒ4 ＝-292.1150(非球面) ｄ4 ＝17.1657(低倍率端），6.5974 (中間倍率) ，0.80
07 (高倍率端) ｒ5 ＝15.5858(非球面) ｄ5 ＝5.000 ｎ5 ＝1.52540 ν5 ＝56.25The data of this embodiment are shown below. Finder magnification 0.40 to 0.75 to 1.43 times Diopter (diopter) -0.5 (diop) Viewing angle (2ω) 55.8 to 29.6 to 15.2 ° r 1 = 8.5460 d 1 = 1.200 n 1 = 1.58423 ν 1 ＝ 30.49 r 2 ＝ 5.3511 (aspherical surface) d 2 ＝ 2.623 r 3 ＝ -15.9103 d 3 = 1.200 n 3 ＝ 1.58423 ν 3 ＝ 30.49 r 4 = -292.1150 (aspherical surface) d 4 ＝ 17.1657 (Lower magnification end), 6.5974 (Middle magnification), 0.80
07 (High magnification end) r 5 = 15.5858 (aspherical surface) d 5 = 5.000 n 5 = 1.52540 ν 5 = 56.25
【００１２】ｒ6 ＝-9.4527 ｄ6 ＝0.7959 (低倍率端) ，6.3260 (中間倍率) ，17.1
588(高倍率端) ｒ7 ＝-74.3095 (非球面) ｄ7 ＝28.000 ｎ7 ＝1.52540 ν7 ＝56.25 ｒ8 ＝∞ ｄ8 ＝1.000 ｒ9 ＝19.5732 ｄ9 ＝26.500 ｎ9 ＝1.52540 ν9 ＝56.25 ｒ10＝∞ ｄ10＝2.241 ｒ11＝18.6988 ｄ11＝2.800 ｎ11＝1.49241 ν11＝57.66 ｒ12＝-23.6975 (非球面) ｄ12＝20.205 ｒ13 (アイポイント)R 6 = -9.4527 d 6 = 0.7959 (low magnification end), 6.3260 (intermediate magnification), 17.1
588 (high magnification end) r 7 = -74.3095 (aspherical) d 7 = 28.000 n 7 = 1.52540 ν 7 = 56.25 r 8 = ∞ d 8 = 1.000 r 9 = 19.5732 d 9 = 26.500 n 9 = 1.52540 ν 9 = 56.25 r 10 = ∞ d 10 = 2.241 r 11 = 18.6988 d 11 = 2.800 n 11 = 1.49241 ν 11 = 57.66 r 12 = -23.6975 (aspheric) d 12 = 20.205 r 13 (eye point)
【００１３】非球面係数 第２面 Ｐ＝1.0000 ， Ｅ＝ 0.23427×10-3， Ｆ＝ 0.97945×10-5， Ｇ＝ 0.10076×10-6 第４面 Ｐ＝1.0000 ， Ｅ＝-0.49994×10-3， Ｆ＝-0.10933×10-4， Ｇ＝ 0.10319×10-5 第５面 Ｐ＝1.0000 ， Ｅ＝-0.45282×10-3， Ｆ＝ 0.31163×10-5， Ｇ＝ 0.49309×10-6 第７面 Ｐ＝1.0000 ， Ｅ＝-0.38875×10-4， Ｆ＝ 0.22624×10-5， Ｇ＝-0.30842×10-6 第１２面 Ｐ＝1.0000 ， Ｅ＝ 0.71235×10-4， Ｆ＝-0.41488×10-6， Ｇ＝ 0.64323×10-8 [0013] aspherical coefficients second surface P = 1.0000, E = 0.23427 × 10 -3, F = 0.97945 × 10 -5, G = 0.10076 × 10 -6 fourth surface P = 1.0000, E = -0.49994 × 10 - 3 , F = -0.109 33 x 10 -4 , G = 0.10319 x 10 -5 5th surface P = 1.0000, E = -0.45282 x 10 -3 , F = 0.31163 x 10 -5 , G = 0.49309 x 10 -6 number 7th surface P = 1.0000, E = -0.38875 × 10 -4 , F = 0.22624 × 10 -5 , G = -0.30842 × 10 -6 12th surface P = 1.0000, E = 0.71235 × 10 -4 , F = -0.41488 × 10 -6 , G = 0.64323 × 10 -8
【００１４】図４乃至６は、本発明の第二実施例を示し
ている。図４は、本実施例の光学系のレンズ構成図であ
る。図５は、図４に示した光学系の光軸に沿った断面図
であり、（ａ）は低倍率端，（ｂ）は中間倍率，（ｃ）
は高倍率端での状態を夫々示した図である。又、図６
は、本実施例の光学系の収差曲線図であり、（ａ）は低
倍率端，（ｂ）は中間倍率，（ｃ）は高倍率端での状態
を夫々示した図である。本実施例の光学系は、図４に示
したように、正の対物レンズ系１と、像反転のためのダ
ハミラー５及び第一プリズム２と、接眼レンズ系４とか
ら構成されている。又、第一プリズム２は、光路長が非
常に長く縦横の長さの比が大きく異なっている。更に、
第一プリズム２を低吸湿材料によって形成することによ
り、吸湿のため発生する過渡的な光学特性の変化を軽減
することができる。4 to 6 show a second embodiment of the present invention. FIG. 4 is a lens configuration diagram of the optical system of the present embodiment. 5 is a sectional view taken along the optical axis of the optical system shown in FIG. 4, where (a) is a low magnification end, (b) is an intermediate magnification, and (c).
[Fig. 3] is a diagram showing states at a high magnification end, respectively. Also, FIG.
[Fig. 4] is an aberration curve diagram of the optical system of the present embodiment, where (a) is a low magnification end, (b) is an intermediate magnification, and (c) is a diagram at a high magnification end. As shown in FIG. 4, the optical system of the present embodiment is composed of a positive objective lens system 1, a roof mirror 5 and a first prism 2 for image inversion, and an eyepiece lens system 4. In addition, the first prism 2 has a very long optical path length, and the ratio of the length to the length is greatly different. Furthermore,
By forming the first prism 2 with a low hygroscopic material, it is possible to reduce a transitional change in optical characteristics caused by moisture absorption.
【００１５】以下、本実施例のデータを示す。 ファインダー倍率 ０．３５〜０．４６〜０．６４倍 視度（ディオプトリー） −０．５(diop) 視野角（２ω） ５５．５〜４１．６〜２９．６° ｒ1 ＝-23.4731 ｄ1 ＝1.000 ｎ1 ＝1.58423 ν1 ＝30.49 ｒ2 ＝4.8006 (非球面) ｄ2 ＝8.0275 (低倍率端) ，5.8273 (中間倍率) ，3.85
81 (高倍率端) ｒ3 ＝6.0446 (非球面) ｄ3 ＝2.965 ｎ3 ＝1.49241 ν3 ＝57.66 ｒ4 ＝-6.1606 (非球面) ｄ4 ＝0.9954 (低倍率端），2.5452 (中間倍率) ，5.08
19 (高倍率端) ｒ5 ＝16.3537 ｄ5 ＝1.000 ｎ5 ＝1.58423 ν5 ＝30.49The data of this embodiment are shown below. Finder magnification 0.35 to 0.46 to 0.64 times Diopter (diopter) -0.5 (diop) Viewing angle (2ω) 55.5 to 41.6 to 29.6 ° r 1 = -23.4731 d 1 = 1.000 n 1 = 1.58423 ν 1 = 30.49 r 2 = 4.8006 (aspherical surface) d 2 = 8.0275 (low magnification end), 5.8273 (intermediate magnification), 3.85
81 (high magnification end) r 3 = 6.0446 (aspheric surface) d 3 = 2.965 n 3 = 1.49241 ν 3 = 57.66 r 4 = -6.1606 ( aspherical) d 4 = 0.9954 (low magnification end), 2.5452 (intermediate magnification) ， 5.08
19 (High magnification end) r 5 = 16.3537 d 5 = 1.000 n 5 = 1.58423 ν 5 = 30.49
【００１６】ｒ6 ＝6.0935 (非球面) ｄ6 ＝14.000 ｒ7 ＝11.8939 ｄ7 ＝2.806 ｎ7 ＝1.49241 ν7 ＝57.66 ｒ8 ＝-22.1551 ｄ8 ＝1.000 ｒ9 ＝∞ ｄ9 ＝32.500 ｎ9 ＝1.52540 ν9 ＝56.25 ｒ10＝∞ ｄ10＝1.971 ｒ11＝17.2118(非球面) ｄ11＝2.004 ｎ11＝1.49241 ν11＝57.66 ｒ12＝-36.2612 ｄ12＝15.000ｒ13 (アイポイント)R 6 = 6.0935 (aspherical surface) d 6 = 14.000 r 7 = 11.8939 d 7 = 2.806 n 7 = 1.49241 ν 7 = 57.66 r 8 = -22.1551 d 8 = 1.000 r 9 = ∞ d 9 = 32.500 n 9 ＝ 1.52540 ν 9 ＝ 56.25 r 10 ＝ ∞ d 10 ＝ 1.971 r 11 ＝ 17.2118 (aspherical surface) d 11 ＝ 2.004 n 11 ＝ 1.49241 ν 11 ＝ 57.66 r 12 ＝ -36.2612 d 12 ＝ 15.000 r 13 (eye point)
【００１７】非球面係数 第２面 Ｐ＝1.0000 ， Ｅ＝-0.14081×10-2， Ｆ＝ 0.16586×10-3， Ｇ＝-0.11584×10-4 第３面 Ｐ＝1.0000 ， Ｅ＝-0.20058×10-2， Ｆ＝ 0.11270×10-4， Ｇ＝-0.21081×10-5 第６面 Ｐ＝1.0000 ， Ｅ＝ 0.91304×10-3， Ｆ＝ 0.25504×10-4， Ｇ＝-0.34333×10-5 第１１面 Ｐ＝1.0000 ， Ｅ＝-0.90149×10-4， Ｆ＝ 0.33791×10-5， Ｇ＝-0.76166×10-7 Aspheric surface coefficient Second surface P = 1.0000, E = -0.14081 × 10 -2 , F = 0.16586 × 10 -3 , G = -0.11584 × 10 -4 Third surface P = 1.0000, E = -0.20058 × 10 -2, F = 0.11270 × 10 -4, G = -0.21081 × 10 -5 sixth surface P = 1.0000, E = 0.91304 × 10 -3, F = 0.25504 × 10 -4, G = -0.34333 × 10 - 5 11th surface P = 1.0000, E = -0.90149 × 10 -4 , F = 0.37991 × 10 -5 , G = -0.76166 × 10 -7
【００１８】図７乃至１１は、本発明の第三実施例を示
している。図７は、本実施例の光学系のレンズ構成図で
あり、（ａ）は通常状態時の構成図，（ｂ）はパノラマ
状態時の構成図である。図８は、図７（ａ）に示した光
学系の光軸に沿った断面図である。図９は、図７（ｂ）
に示した光学系の光軸に沿った断面図である。図１０
は、本実施例における光学系の通常状態時の収差曲線図
であり、（ａ）は低倍率端，（ｂ）は中間倍率，（ｃ）
は高倍率端での状態を夫々示した図である。図１１は、
本実施例における光学系のパノラマ状態時の収差曲線図
であり、（ａ）は低倍率端，（ｂ）は中間倍率，（ｃ）
は高倍率端での状態を夫々示した図である。7 to 11 show a third embodiment of the present invention. 7A and 7B are lens configuration diagrams of the optical system of the present embodiment, FIG. 7A is a configuration diagram in a normal state, and FIG. 7B is a configuration diagram in a panoramic state. FIG. 8 is a sectional view taken along the optical axis of the optical system shown in FIG. FIG. 9 shows FIG. 7 (b).
2 is a cross-sectional view of the optical system shown in FIG. Figure 10
FIG. 4A is an aberration curve diagram of an optical system in a normal state in the present embodiment, where (a) is a low magnification end, (b) is an intermediate magnification, and (c).
[Fig. 3] is a diagram showing states at a high magnification end, respectively. FIG. 11 shows
FIG. 6 is an aberration curve diagram of the optical system in a panoramic state in the present embodiment, where (a) is a low magnification end, (b) is an intermediate magnification, and (c).
[Fig. 3] is a diagram showing states at a high magnification end, respectively.
【００１９】本実施例の光学系は、まず通常状態では、
図７（ａ）に示したように、正の対物レンズ系１と、像
反転のための第一プリズム２及び第二プリズム３と、接
眼レンズ系４とから構成されている。又、パノラマ状態
では、同図（ｂ）に示したように、第二プリズム３と接
眼レンズ系４との間に倍率変換用レンズ６を配置して倍
率を高くしている他は、同図（ａ）に示した光学系と同
様に構成されている。又、第一プリズム２及び第二プリ
ズム３は光路長が長く縦横の長さの比が異なるように構
成され、倍率変換用レンズ６は、中肉が厚く縦横の長さ
の比が異なるように構成されている。更に、第一プリズ
ム２，第二プリズム３及び倍率変換用レンズ６を夫々低
吸湿有機材料によって形成することにより、吸湿のため
発生する過渡的な光学特性の変化を軽減することができ
る。In the optical system of this embodiment, first, in a normal state,
As shown in FIG. 7A, it is composed of a positive objective lens system 1, a first prism 2 and a second prism 3 for image inversion, and an eyepiece lens system 4. Further, in the panoramic state, as shown in FIG. 2B, a magnification conversion lens 6 is arranged between the second prism 3 and the eyepiece lens system 4 to increase the magnification. It has the same configuration as the optical system shown in FIG. Further, the first prism 2 and the second prism 3 are configured such that the optical path length is long and the length-width ratio is different, and the magnification conversion lens 6 is made thicker and the length-width ratio is different. It is configured. Further, by forming each of the first prism 2, the second prism 3 and the magnification conversion lens 6 with a low hygroscopic organic material, it is possible to reduce a transitional change in optical characteristics caused by moisture absorption.
【００２０】以下、本実施例のデータを示す。 （通常状態） ファインダー倍率 ０．３３〜０．５４〜０．８７倍 視度（ディオプトリー） −０．５(diop) 視野角（２ω） ３４．２２〜２１．２３〜１３．１０
５° 視野比 ３６：２４ ｒ1 ＝20.4672 ｄ1 ＝1.000 ｎ1 ＝1.58423 ν1 ＝30.49 ｒ2 ＝4.3097 (非球面) ｄ2 ＝10.4731(低倍率端) ，2.6498 (中間倍率) ，2.52
93 (高倍率端) ｒ3 ＝6.8967 (非球面) ｄ3 ＝1.838 ｎ3 ＝1.49241 ν3 ＝57.66 ｒ4 ＝10.1910 ｄ4 ＝2.5589 (低倍率端），5.8290 (中間倍率) ，0.98
66 (高倍率端) ｒ5 ＝9.2564 (非球面) ｄ5 ＝3.160 ｎ5 ＝1.49241 ν5 ＝57.66The data of this embodiment are shown below. (Normal state) Finder magnification 0.33 to 0.54 to 0.87 times Diopter (diopter) -0.5 (diop) Viewing angle (2ω) 34.22 to 21.23 to 13.10
5 ° Field ratio 36:24 r 1 = 20.4672 d 1 = 1.000 n 1 = 1.58423 ν 1 ＝ 30.49 r 2 ＝ 4.3097 (aspherical surface) d 2 = 10.4731 (low magnification end), 2.6498 (intermediate magnification), 2.52
93 (high magnification end) r 3 = 6.8967 (aspherical surface) d 3 = 1.838 n 3 = 1.49241 ν 3 = 57.66 r 4 = 10.1910 d 4 = 2.5589 (low magnification end), 5.8290 (intermediate magnification), 0.98
66 (High magnification end) r 5 = 9.2564 (aspherical surface) d 5 = 3.160 n 5 = 1.49241 ν 5 = 57.66
【００２１】ｒ6 ＝-9.9812 ｄ6 ＝0.8000 (低倍率端) ，5.3531 (中間倍率) ，10.3
162(高倍率端) ｒ7 ＝-43.0721 (非球面) ｄ7 ＝19.470 ｎ7 ＝1.52540 ν7 ＝56.25 ｒ8 ＝-11.8630 ｄ8 ＝1.000 ｒ9 ＝∞ ｄ9 ＝0.0000 ｒ10＝∞ ｄ10＝16.047 ｎ10＝1.52540 ν10＝56.25 ｒ11＝∞ ｄ11＝9.500 ｒ12＝15.9091(非球面) ｄ12＝3.039 ｎ12＝1.49241 ν12＝57.66 ｒ13＝-27.6806 ｄ13＝18.786 ｒ14 (アイポイント)R 6 = -9.9812 d 6 = 0.8000 (low magnification end), 5.3531 (intermediate magnification), 10.3
162 (high magnification end) r 7 = -43.0721 (aspherical surface) d 7 = 19.470 n 7 = 1.52540 ν 7 = 56.25 r 8 = -11.8630 d 8 = 1.000 r 9 = ∞ d 9 = 0.0000 r 10 = ∞ d 10 = 16.047 n 10 = 1.52540 ν 10 ＝ 56.25 r 11 ＝ ∞ d 11 ＝ 9.500 r 12 ＝ 15.9091 (aspherical surface) d 12 ＝ 3.039 n 12 ＝ 1.49241 ν 12 ＝ 57.66 r 13 ＝ -27.6806 d 13 ＝ 18.786 r 14 ( (Eye point)
【００２２】非球面係数 第２面 Ｐ＝1.0000 Ｅ＝-0.10844×10-2， Ｆ＝ 0.50237×10-4， Ｇ＝-0.93916×10-5， Ｈ＝ 0.21804×10-6 第３面 Ｐ＝1.0000 Ｅ＝ 0.73203×10-4， Ｆ＝-0.45235×10-4， Ｇ＝ 0.38861×10-5， Ｈ＝-0.14219×10-6 第５面 Ｐ＝1.0000 Ｅ＝-0.50796×10-3， Ｆ＝ 0.37689×10-4， Ｇ＝-0.35484×10-5， Ｈ＝ 0.12772×10-6 第７面 Ｐ＝1.0000 Ｅ＝-0.79767×10-3， Ｆ＝ 0.10149×10-3， Ｇ＝-0.34151×10-5， Ｈ＝ 0.19633×10-6 第１２面 Ｐ＝1.0000 Ｅ＝-0.11430×10-3， Ｆ＝ 0.13197×10-5， Ｇ＝-0.33726×10-7， Ｈ＝-0.43895×10-9 Aspheric surface coefficient Second surface P = 1.0000 E = -0.10844 × 10 -2 , F = 0.50237 × 10 -4 , G = -0.93916 × 10 -5 , H = 0.21804 × 10 -6 Third surface P = 1.0000 E = 0.73203 x 10 -4 , F = -0.45235 x 10 -4 , G = 0.38861 x 10 -5 , H = -0.14219 x 10 -6 5th surface P = 1.0000 E = -0.50796 x 10 -3 , F = 0.37689 x 10 -4 , G = -0.35484 x 10 -5 , H = 0.12772 x 10 -6 7th surface P = 1.0000 E = -0.79767 x 10 -3 , F = 0.10149 x 10 -3 , G = -0.34151 × 10 -5 , H = 0.19633 × 10 -6 12th surface P = 1.0000 E = -0.11430 × 10 -3 , F = 0.13197 × 10 -5 , G = -0.33726 × 10 -7 , H = -0.43895 × 10 -9
【００２３】（パノラマ状態） ファインダー倍率 ０．４０〜０．６５〜１．０４倍 視度（ディオプトリー） −０．５(diop) 視野角（２ω） ２９．８５〜１８．５８〜１１．５３
° 視野比 ３６：１３ ｒ1 ＝20.4672 ｄ1 ＝1.000 ｎ1 ＝1.58423 ν1 ＝30.49 ｒ2 ＝4.3097 (非球面) ｄ2 ＝10.4731(低倍率端) ，2.6498 (中間倍率) ，2.52
93 (高倍率端) ｒ3 ＝6.8967 (非球面) ｄ3 ＝1.838 ｎ3 ＝1.49241 ν3 ＝57.66 ｒ4 ＝10.1910 ｄ4 ＝2.5589 (低倍率端），5.8290 (中間倍率) ，0.98
66 (高倍率端) ｒ5 ＝9.2564 (非球面) ｄ5 ＝3.160 ｎ5 ＝1.49241 ν5 ＝57.66 ｒ6 ＝-9.9812 ｄ6 ＝0.8000 (低倍率端) ，5.3531 (中間倍率) ，10.3
162(高倍率端) ｒ7 ＝-43.0721 (非球面) ｄ7 ＝19.470 ｎ7 ＝1.52540 ν7 ＝56.25(Panorama state) Finder magnification 0.40 to 0.65 to 1.04 times Diopter (diopter) -0.5 (diop) Viewing angle (2ω) 29.85 to 18.58 to 11.53
° Field ratio 36:13 r 1 = 20.4672 d 1 = 1.000 n 1 = 1.58423 ν 1 ＝ 30.49 r 2 ＝ 4.3097 (aspherical surface) d 2 = 10.4731 (low magnification end), 2.6498 (intermediate magnification), 2.52
93 (high magnification end) r 3 = 6.8967 (aspherical surface) d 3 = 1.838 n 3 = 1.49241 ν 3 = 57.66 r 4 = 10.1910 d 4 = 2.5589 (low magnification end), 5.8290 (intermediate magnification), 0.98
66 (high magnification end) r 5 = 9.2564 (aspherical surface) d 5 = 3.160 n 5 = 1.49 241 ν 5 = 57.66 r 6 = -9.9812 d 6 = 0.8000 (low magnification end), 5.3531 (intermediate magnification), 10.3
162 (High magnification end) r 7 = -43.0721 (Aspherical surface) d 7 = 19.470 n 7 = 1.52540 ν 7 = 56.25
【００２４】ｒ8 ＝-11.8630 ｄ8 ＝1.000 ｒ9 ＝∞ ｄ9 ＝0.000 ｒ10＝∞ ｄ10＝16.047 ｎ10＝1.52540 ν10＝56.25 ｒ11＝∞ ｄ11＝1.000 ｒ12＝46.2290 ｄ12＝7.200 ｎ12＝1.52540 ν12＝56.25 ｒ13＝-244.7050 ｄ13＝1.300 ｒ14＝15.9091(非球面) ｄ14＝3.039 ｎ14＝1.49241 ν14＝57.66 ｒ15＝-27.6806 ｄ15＝17.286 ｒ16 (アイポイント)R 8 = -11.8630 d 8 = 1.000 r 9 = ∞ d 9 = 0.000 r 10 = ∞ d 10 = 16.047 n 10 = 1.52540 ν 10 = 56.25 r 11 = ∞ d 11 = 1.000 r 12 = 46.2290 d 12 = 7.200 n 12 = 1.52540 ν 12 = 56.25 r 13 = -244.7050 d 13 = 1.300 r 14 = 15.9091 ( aspherical) d 14 = 3.039 n 14 = 1.49241 ν 14 = 57.66 r 15 = -27.6806 d 15 = 17.286 r 16 (Eye point)
【００２５】非球面係数 第２面 Ｐ＝1.0000 Ｅ＝-0.10844×10-2， Ｆ＝ 0.50237×10-4， Ｇ＝-0.93916×10-5， Ｈ＝ 0.21804×10-6 第３面 Ｐ＝1.0000 Ｅ＝ 0.73203×10-4， Ｆ＝-0.45235×10-4， Ｇ＝ 0.38861×10-5， Ｈ＝-0.14219×10-6 第５面 Ｐ＝1.0000 Ｅ＝-0.50796×10-3， Ｆ＝ 0.37689×10-4， Ｇ＝-0.35484×10-5， Ｈ＝ 0.12772×10-6 第７面 Ｐ＝1.0000 Ｅ＝-0.79767×10-3， Ｆ＝ 0.10149×10-3， Ｇ＝-0.34151×10-5， Ｈ＝ 0.19633×10-6 第１４面 Ｐ＝1.0000 Ｅ＝-0.11430×10-3， Ｆ＝ 0.13197×10-5， Ｇ＝-0.33726×10-7， Ｈ＝-0.43895×10-9 Aspheric coefficient 2nd surface P = 1.0000 E = -0.10844 × 10 -2 , F = 0.50237 × 10 -4 , G = -0.93916 × 10 -5 , H = 0.21804 × 10 -6 3rd surface P = 1.0000 E = 0.73203 x 10 -4 , F = -0.45235 x 10 -4 , G = 0.38861 x 10 -5 , H = -0.14219 x 10 -6 5th surface P = 1.0000 E = -0.50796 x 10 -3 , F = 0.37689 x 10 -4 , G = -0.35484 x 10 -5 , H = 0.12772 x 10 -6 7th surface P = 1.0000 E = -0.79767 x 10 -3 , F = 0.10149 x 10 -3 , G = -0.34151 × 10 -5 , H = 0.19633 × 10 -6 14th surface P = 1.0000 E = -0.11430 × 10 -3 , F = 0.13197 × 10 -5 , G = -0.33726 × 10 -7 , H = -0.43895 × 10 -9
【００２６】図１２乃至１４は、本発明の第四実施例を
示している。図１２は、本実施例の光学系のレンズ構成
図である。図１３は、図１２に示した光学系の光軸に沿
った断面図である。図１４は、本実施例の光学系の収差
曲線図である。本実施例の光学系は、図１２に示したよ
うに、正の対物レンズ系１と、像反転のための第一プリ
ズム２及び第二プリズム３と、接眼レンズ系４とから構
成されている。又、第一プリズム２及び第二プリズム３
は、夫々光路長が長く縦横の長さの比が異なるように構
成されている。更に、第一プリズム２及び第二プリズム
３を低吸湿有機材料を用いて形成することにより、吸湿
のため発生する過渡的な光学特性の変化を軽減すること
ができる。尚、本実施例の光学系は、双眼鏡を構成する
ものである。12 to 14 show a fourth embodiment of the present invention. FIG. 12 is a lens configuration diagram of the optical system of the present embodiment. FIG. 13 is a sectional view taken along the optical axis of the optical system shown in FIG. FIG. 14 is an aberration curve diagram of the optical system of this example. As shown in FIG. 12, the optical system of the present embodiment is composed of a positive objective lens system 1, a first prism 2 and a second prism 3 for image reversal, and an eyepiece lens system 4. . Also, the first prism 2 and the second prism 3
Have long optical path lengths and different vertical-horizontal length ratios. Furthermore, by forming the first prism 2 and the second prism 3 using a low hygroscopic organic material, it is possible to reduce a transitional change in optical characteristics caused by moisture absorption. The optical system of this embodiment constitutes binoculars.
【００２７】以下、本実施例のデータを示す。 視野角（２ω） ２６．３° ｒ1 ＝43.6800 ｄ1 ＝5.000 ｎ1 ＝1.51633 ν1 ＝64.15 ｒ2 ＝-39.7600 ｄ2 ＝2.2000 ｎ2 ＝1.62004 ν2 ＝36.25 ｒ3 ＝-287.7600 ｄ3 ＝37.5886 ｒ4 ＝∞ ｄ4 ＝36.6200 ｎ4 ＝1.52540 ν4 ＝56.25 ｒ5 ＝∞ ｄ5 ＝1.000The data of this embodiment are shown below. Viewing angle (2ω) 26.3 ° r 1 = 43.6800 d 1 = 5.000 n 1 = 1.51633 ν 1 = 64.15 r 2 = -39.7600 d 2 = 2.2000 n 2 = 1.62004 ν 2 = 36.25 r 3 = -287.7600 d 3 = 37.5886 r 4 = ∞ d 4 = 36.6200 n 4 = 1.52540 ν 4 = 56.25 r 5 = ∞ d 5 = 1.000
【００２８】ｒ6 ＝∞ ｄ6 ＝26.0000 ｎ6 ＝1.52540 ν6 ＝56.25 ｒ7 ＝∞ ｄ7 ＝12.7600 ｒ8 ＝66.8500 ｄ8 ＝1.2000 ｎ8 ＝1.80518 ν8 ＝25.43 ｒ9 ＝9.3700 ｄ9 ＝8.1000 ｎ9 ＝1.58913 ν9 ＝61.18 ｒ10＝-13.1800 ｄ10＝0.2300 ｒ11＝10.4500 ｄ11＝5.0000 ｎ11＝1.51633 ν11＝64.15 ｒ12＝-471.5600 ｄ12＝11.0000 ｒ13 (アイポイント)R 6 = ∞ d 6 = 26.0000 n 6 = 1.52540 ν 6 = 56.25 r 7 = ∞ d 7 = 12.7600 r 8 = 66.8 500 d 8 = 1.2000 n 8 = 1.80518 ν 8 = 25.43 r 9 = 9.3700 d 9 = 8.1000 n 9 = 1.58913 ν 9 ＝ 61.18 r 10 ＝ -13.1800 d 10 ＝ 0.2300 r 11 = 10.4500 d 11 ＝ 5.0000 n 11 ＝ 1.51633 ν 11 ＝ 64.15 r 12 ＝ -471.5600 d 12 ＝ 11.0000 r 13 (eye point)
【００２９】但し、上記各実施例において、ｒ1 ，
ｒ2 ，・・・・は各レンズ面の曲率半径、ｄ1 ，ｄ2 ，
・・・・は各レンズの肉厚又は間隔、ｎ1 ，ｎ2 ，・・
・・は各レンズの屈折率、ν1 ，ν2 ・・・・は各レン
ズのアッベ数である。尚、上記各実施例における非球面
形状は、光軸方向の座標をＸ，光軸に直交する方向の座
標をＹとしたとき、次式によって示される。 Ｘ＝（Ｙ2 ／ｒ）／〔１＋｛１−Ｐ（Ｙ／ｒ）2 ｝1/2 〕 ＋ＥＹ4 ＋ＦＹ6 ＋ＧＹ8 ＋ＨＹ10 但し、ｒは光軸曲率半径、Ｐは円錐係数、Ｅ，Ｆ，Ｇ，
Ｈは夫々非球面係数である。However, in each of the above embodiments, r 1 ,
r 2 , ..., Radius of curvature of each lens surface, d 1 , d 2 ,
.... wall thickness or spacing of each lens, n 1, n 2, ··
··· is the refractive index of each lens, ν 1 , ν 2 ··· is the Abbe number of each lens. The aspherical shape in each of the above-described embodiments is represented by the following equation, where X is the coordinate in the optical axis direction and Y is the coordinate in the direction orthogonal to the optical axis. X = (Y 2 / r) / [1+ {1-P (Y / r) 2} 1/2 ] + EY 4 + FY 6 + GY 8 + HY 10 where, r is the optical axis of curvature radius, P is a conical coefficient, E, F, G,
H is an aspherical coefficient, respectively.
【００３０】[0030]
【発明の効果】上述のように、本発明の低吸湿有機材料
を用いたファインダー光学系は、当該光学系の各構成部
品が低吸湿有機材料によって形成されているため、前記
光学部品の吸湿による過渡的な光学特性の変化を防止で
きるという実用上優れた利点を有する。As described above, in the finder optical system using the low hygroscopic organic material of the present invention, since each component of the optical system is formed of the low hygroscopic organic material, it is possible that the optical parts absorb moisture. It has an advantage in practical use that it can prevent a transitional change in optical characteristics.
【図１】本発明による第一実施例の光学系のレンズ構成
図である。FIG. 1 is a lens configuration diagram of an optical system of a first embodiment according to the present invention.
【図２】図１に示した光学系の光軸方向に沿った断面図
である。2 is a sectional view taken along the optical axis direction of the optical system shown in FIG.
【図３】本発明による第一実施例の光学系の収差曲線図
であり、（ａ）は低倍率端，（ｂ）は中間倍率，（ｃ）
は高倍率端での状態を夫々示した図である。FIG. 3 is an aberration curve diagram of the optical system of the first example according to the present invention, where (a) is a low magnification end, (b) is an intermediate magnification, and (c).
[Fig. 3] is a diagram showing states at a high magnification end, respectively.
【図４】本発明による第二実施例の光学系のレンズ構成
図である。FIG. 4 is a lens configuration diagram of an optical system of a second embodiment according to the present invention.
【図５】図４に示した光学系の光軸方向に沿った断面図
である。5 is a sectional view taken along the optical axis direction of the optical system shown in FIG.
【図６】本発明による第二実施例の光学系収差曲線図で
あり、（ａ）は低倍率端，（ｂ）は中間倍率，（ｃ）は
高倍率端での状態を夫々示した図である。6A and 6B are optical system aberration curve diagrams of the second embodiment according to the present invention, in which FIG. 6A shows a state at a low magnification end, FIG. 6B shows an intermediate magnification, and FIG. 6C shows a state at a high magnification end. Is.
【図７】本発明による第三実施例の光学系のレンズ構成
図であり、（ａ）は通常状態時の構成図，（ｂ）はパノ
ラマ状態時の構成図である。7A and 7B are lens configuration diagrams of an optical system of a third embodiment according to the present invention, FIG. 7A is a configuration diagram in a normal state, and FIG. 7B is a configuration diagram in a panoramic state.
【図８】図７（ａ）に示した光学系の光軸方向に沿った
断面図である。8 is a sectional view taken along the optical axis direction of the optical system shown in FIG.
【図９】図７（ｂ）に示した光学系の光軸方向に沿った
断面図である。9 is a sectional view taken along the optical axis direction of the optical system shown in FIG. 7 (b).
【図１０】本発明による第三実施例の光学系（通常状態
時）の収差曲線図であり、（ａ）は低倍率端，（ｂ）は
中間倍率，（ｃ）は高倍率端での状態を夫々示した図で
ある。FIG. 10 is an aberration curve diagram of an optical system (in a normal state) of the third example according to the present invention, in which (a) is a low magnification end, (b) is an intermediate magnification, and (c) is a high magnification end. It is the figure which showed each state.
【図１１】本発明による第三実施例の光学系（パノラマ
状態時）の収差曲線図であり、（ａ）は低倍率端，
（ｂ）は中間倍率，（ｃ）は高倍率端での状態を夫々示
した図である。FIG. 11 is an aberration curve diagram of an optical system (in a panoramic state) according to the third embodiment of the present invention, in which (a) is a low magnification end,
(B) is a diagram showing an intermediate magnification, and (c) is a diagram showing a state at a high magnification end, respectively.
【図１２】本発明による第四実施例の光学系のレンズ構
成図である。FIG. 12 is a lens configuration diagram of an optical system of a fourth example according to the present invention.
【図１３】図１２に示した光学系の光軸方向に沿った断
面図である。13 is a cross-sectional view taken along the optical axis direction of the optical system shown in FIG.
【図１４】本発明による第三実施例の光学系の収差曲線
図である。FIG. 14 is an aberration curve diagram for an optical system according to Example 3 of the present invention.
１ 対物レンズ系 ２ 第一プリズム ３ 第二プリズム ４ 接眼レンズ系 ５ ダハミラー ６ 倍率変換用レンズ Ｌ 光軸 1 Objective Lens System 2 First Prism 3 Second Prism 4 Eyepiece System 5 Roof Mirror 6 Magnification Conversion Lens L Optical Axis
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成６年１１月１５日[Submission date] November 15, 1994
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００７[Correction target item name] 0007
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００７】ところで、屈折率分布が光学部品のパワー
に与える影響は以下の通りである。 （１） 光軸方向の屈折率勾配は殆どパワーに影響を与
えない。 （２） 光軸と垂直な方向へ向かって屈折率の勾配が大
きい程、パワーも大きくなる。 （３） 光軸と傾いた方向へ向かって屈折率勾配は、上
記（１）と（２）との間の状態の下でパワーへの影響度
が変化する。 （４） 光線の通過する媒質の厚みが大きい程、パワー
も大きくなる。 （５） 光軸に垂直で互いに直交する方向の屈折率勾配
が異なると、アジマスによりパワーが異なり、光軸上に
非点隔差が発生する。 更に、屈折率勾配が形成される状態においては、 （６） 光軸から外気と接する面までの距離が異なると
屈折率勾配が異なるということが云える。The influence of the refractive index distribution on the power of optical components is as follows. (1) The refractive index gradient in the optical axis direction hardly affects the power. (2) The power increases as the gradient of the refractive index increases in the direction perpendicular to the optical axis. (3) The degree of influence on the power of the refractive index gradient in the direction inclined with respect to the optical axis changes under the condition between the above (1) and (2). (4) The power increases as the thickness of the medium through which the light ray passes increases. (5) If the refractive index gradients in the directions perpendicular to the optical axis and orthogonal to each other are different, the power is different due to azimuth, and astigmatic difference occurs on the optical axis. Further, in the state where the refractive index gradient is formed, (6) It can be said that the refractive index gradient is different if the distance from the optical axis to the surface in contact with the outside air is different.
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００８[Correction target item name] 0008
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００８】従って、上記性質から推定して以下の形態
を有する光学部品について、屈折率分布に基づくパワー
の発生や中心でのアスの発生が顕著になると考えられ
る。 （イ） 上記（４）を根拠として、光軸に沿った距離の
長い光学部品。 （ロ） 上記（１）に従う入射出面や（３）に従う反射
面といった光学面に対し、（２）に示したような外側面
の面積が無視できない光学系。 （ハ） 上記（６）に従う光軸に垂直な断面の形状が等
方的なものから著しく外れる、例えば縦横の長さの比が
大きく異なる光学部品。 （ニ） 境界面の一部がコーティングや塗装で覆われて
いて吸湿に関与できる面積や方向に偏りが生じる部品。Therefore, it is considered that the generation of power based on the refractive index distribution and the generation of astigmatism at the center become conspicuous in the optical component having the following form estimated from the above properties. (A) An optical component having a long distance along the optical axis based on the above (4). (B) An optical system in which the area of the outer side surface as shown in (2) is not negligible with respect to the optical surface such as the entrance / exit surface according to (1) and the reflection surface according to (3). (C) An optical component in which the shape of the cross section perpendicular to the optical axis according to (6) above is significantly deviated from isotropic, for example, the ratio of the length to the length is greatly different. (D) A part of the boundary surface is covered with coating or paint, and there is a deviation in the area or direction in which it can participate in moisture absorption.
【手続補正３】[Procedure 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２１[Correction target item name] 0021
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００２１】ｒ6 ＝-9.9812 ｄ6 ＝0.8000 (低倍率端) ，5.3531 (中間倍率) ，10.3
162(高倍率端) ｒ7 ＝-43.0721 (非球面) ｄ7 ＝19.470 ｎ7 ＝1.52540 ν7 ＝56.25 ｒ8 ＝-11.8630 ｄ8 ＝1.000 ｒ9 ＝∞（視野枠） ｄ9 ＝0.0000 ｒ10＝∞ ｄ10＝16.047 ｎ10＝1.52540 ν10＝56.25 ｒ11＝∞ ｄ11＝9.500 ｒ12＝15.9091(非球面) ｄ12＝3.039 ｎ12＝1.49241 ν12＝57.66 ｒ13＝-27.6806 ｄ13＝18.786 ｒ14 (アイポイント)R 6 = -9.9812 d 6 = 0.8000 (low magnification end), 5.3531 (intermediate magnification), 10.3
162 (high magnification end) r 7 = -43.0721 (aspherical surface) d 7 = 19.470 n 7 = 1.52540 v 7 = 56.25 r 8 = -11.8630 d 8 = 1.000 r 9 = ∞ (field frame) d 9 = 0.0000 r 10 ＝ ∞ d 10 ＝ 16.047 n 10 ＝ 1.52540 ν 10 ＝ 56.25 r 11 ＝ ∞ d 11 ＝ 9.500 r 12 ＝ 15.9091 (aspherical surface) d 12 ＝ 3.039 n 12 ＝ 1.49241 ν 12 ＝ 57.66 r 13 ＝ -27.6806 d 13 ＝ 18.786 r 14 (eyepoint)
【手続補正４】[Procedure amendment 4]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２４[Name of item to be corrected] 0024
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００２４】ｒ8 ＝-11.8630 ｄ8 ＝1.000 ｒ9 ＝∞（視野枠） ｄ9 ＝0.000 ｒ10＝∞ ｄ10＝16.047 ｎ10＝1.52540 ν10＝56.25 ｒ11＝∞ ｄ11＝1.000 ｒ12＝46.2290 ｄ12＝7.200 ｎ12＝1.52540 ν12＝56.25 ｒ13＝-244.7050 ｄ13＝1.300 ｒ14＝15.9091(非球面) ｄ14＝3.039 ｎ14＝1.49241 ν14＝57.66 ｒ15＝-27.6806 ｄ15＝17.286 ｒ16 (アイポイント) ─────────────────────────────────────────────────────
R 8 = -11.8630 d 8 = 1.000 r 9 = ∞ (field frame) d 9 = 0.000 r 10 = ∞ d 10 = 16.047 n 10 = 1.52540 ν 10 = 56.25 r 11 = ∞ d 11 = 1.000 r 12 = 46.2290 d 12 = 7.200 n 12 = 1.52540 ν 12 = 56.25 r 13 = -244.7050 d 13 = 1.300 r 14 = 15.9091 ( aspherical) d 14 = 3.039 n 14 = 1.49241 ν 14 = 57.66 r 15 = -27.6806 d 15 = 17.286 r 16 (eyepoint) ─────────────────────────────────────────── ───────────
【手続補正書】[Procedure amendment]
【提出日】平成６年１１月１５日[Submission date] November 15, 1994
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図８[Correction target item name] Figure 8
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図８】 [Figure 8]
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図９[Correction target item name] Figure 9
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図９】 [Figure 9]
───────────────────────────────────────────────────── フロントページの続き (72)発明者 諸岡 優 東京都渋谷区幡ヶ谷２丁目43番２号 オリ ンパス光学工業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yu Morooka 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd.
Claims (4)
物レンズ系によって形成された被写体像を正立させる像
正立系と、前記像を観察者の眼球により観察できるよう
にアイポイントへ導く接眼レンズ系から成る光学系にお
いて、 前記光学系が低吸湿有機材料を用いた部材により構成さ
れていることを特徴とする低吸湿有機材料を用いたファ
インダー光学系。1. From an object side, an objective lens system, an image erecting system for erecting an object image formed by the objective lens system, and an image erecting system for guiding the image to an eye point so that an observer's eye can observe the image. An optical system comprising an eyepiece lens system, wherein the optical system is composed of a member using a low hygroscopic organic material, and a finder optical system using a low hygroscopic organic material.
の縦横の長さの比が相違し且つ低吸湿有機材料により形
成されたレンズが設けられていることを特徴とする請求
項１に記載の低吸湿有機材料を用いたファインダー光学
系。2. A lens, which is relatively thick and has a different ratio of length and width of a cross-sectional shape perpendicular to the optical axis and which is formed of a low hygroscopic organic material, is provided. A finder optical system using the low hygroscopic organic material described in 1.
状の縦横の長さの比が異なり且つ低吸湿有機材料により
形成されたプリズムが設けられていることを特徴とする
請求項１に記載の低吸湿有機材料を用いたファインダー
光学系。3. A prism having a relatively long optical path length and having a different ratio of vertical and horizontal lengths of a cross-sectional shape perpendicular to the optical axis and provided with a low hygroscopic organic material is provided. A finder optical system using the low hygroscopic organic material described in.
料等により被膜され且つ低吸湿有機材料により形成され
た光学部品が設けられていることを特徴とする請求項１
に記載の低吸湿有機材料を用いたファインダー光学系。4. An optical component, wherein a part of the boundary surface is coated with a coating, a paint or the like, and an optical component formed of a low hygroscopic organic material is provided.
A finder optical system using the low hygroscopic organic material described in.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5277032A JPH07128707A (en) | 1993-11-05 | 1993-11-05 | Finder optical system using low moisture absorption organic material |
| US08/335,352 US5581400A (en) | 1993-11-05 | 1994-11-03 | Finder optical system with low-hygroscopic organic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5277032A JPH07128707A (en) | 1993-11-05 | 1993-11-05 | Finder optical system using low moisture absorption organic material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07128707A true JPH07128707A (en) | 1995-05-19 |
Family
ID=17577829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5277032A Pending JPH07128707A (en) | 1993-11-05 | 1993-11-05 | Finder optical system using low moisture absorption organic material |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5581400A (en) |
| JP (1) | JPH07128707A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6084720A (en) * | 1997-10-28 | 2000-07-04 | Olympus Optical Co., Ltd. | Small-sized real image mode zoom finder |
| US6278554B1 (en) | 1998-10-30 | 2001-08-21 | Canon Kabushiki Kaisha | Image pickup optical system |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6011648A (en) * | 1997-05-15 | 2000-01-04 | Minolta Co., Ltd. | Optical system having an optical element made of resin |
| JPH10333033A (en) | 1997-06-02 | 1998-12-18 | Olympus Optical Co Ltd | Real image type variable power finder |
| US6154314A (en) * | 1997-12-26 | 2000-11-28 | Olympus Optical Co., Ltd. | Real image mode variable magnification finder |
| JPH11344679A (en) * | 1998-06-03 | 1999-12-14 | Olympus Optical Co Ltd | Real-image type variable power finder |
| JP2000089104A (en) * | 1998-09-10 | 2000-03-31 | Asahi Optical Co Ltd | Anti-vibration optical system for observation optical equipment |
| JP3455444B2 (en) * | 1998-11-17 | 2003-10-14 | ペンタックス株式会社 | Real image finder optical system |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4535026A (en) * | 1983-06-29 | 1985-08-13 | The United States Of America As Represented By The United States Department Of Energy | Antireflective graded index silica coating, method for making |
| JPH0658454B2 (en) * | 1985-07-03 | 1994-08-03 | キヤノン株式会社 | Variable magnification finder |
| JPH0814661B2 (en) * | 1986-02-17 | 1996-02-14 | オリンパス光学工業株式会社 | View conversion optical system |
| JPH03181908A (en) * | 1989-12-12 | 1991-08-07 | Konica Corp | Small-sized zoom lens compensated for influence of environmental change |
| US5251069A (en) * | 1989-12-28 | 1993-10-05 | Asahi Kogaku Kogyo K.K. | Imaging lens system |
| JP3064337B2 (en) * | 1990-06-21 | 2000-07-12 | オリンパス光学工業株式会社 | Real image type variable magnification finder optical system |
| JPH04349418A (en) * | 1991-05-27 | 1992-12-03 | Nisshin Koki Kk | Wide-angle lens |
| JPH06324260A (en) * | 1993-05-14 | 1994-11-25 | Olympus Optical Co Ltd | Focus detector |
-
1993
- 1993-11-05 JP JP5277032A patent/JPH07128707A/en active Pending
-
1994
- 1994-11-03 US US08/335,352 patent/US5581400A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6084720A (en) * | 1997-10-28 | 2000-07-04 | Olympus Optical Co., Ltd. | Small-sized real image mode zoom finder |
| US6278554B1 (en) | 1998-10-30 | 2001-08-21 | Canon Kabushiki Kaisha | Image pickup optical system |
Also Published As
| Publication number | Publication date |
|---|---|
| US5581400A (en) | 1996-12-03 |
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